动力作用下砂土的残余体变及其时域连续模型  

Irreversible volumetric deformation of sand under dynamic loading and its time-domain continuous model

作　　者：陈文化[1] 门福录[2] 

机构地区：[1]北方交通大学土木建筑学院,北京100044 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《岩土力学》2003年第6期947-951,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助课题(编号:50008001);地震工程与工程振动开放实验室资助课题(编号:006)

摘　　要：通过对砂土动力剪切荷载作用过程中的土骨架的弹性和塑性分析,研究了土骨架接触面部分可能发生的弹性恢复和永久变形以及破碎引起的最剧烈的塑性变形;并且,提出了可以通过液化前后颗粒粒径的质量百分含量的对比试验,来验证破碎模型的合理性;为进行砂土动力非线性变形和液化的数值模拟,结合砂土的剪切非线性的本构,总结了更为简化的时域连续的函数经验公式,使得在时域内进行土壤动力特性和动力非线性反应分析,以及用剪胀性理论解释动力液化和变形问题易于进行。In order to research the elastoplastic deformation of sand skeleton under dynamical shear loading some constitutive models are analyzed and built, including the model of the finally or the irreversible deformation in the touched part of particles which maybe crashed; and a method is designed to verify the above model through testing the percent change of masses of different sizes particles before and after sand liquefaction. In order to simulate the nonlinear dynamical volumetric deformation and constitutive relation of shear stress-shear strain during the liquefaction, a time-domain-discrete model of sand diliatancy is suggested; the simplified equation can easily to explain the liquefaction and easily to analyze the dynamical deformations of sand.

关 键 词：砂土 土骨架弹-塑性变形 破碎模型 验证试验 时域连续模型 残余体积变形 动力变形 

分 类 号：TU441.5[建筑科学—岩土工程] TU411.8[建筑科学—土工工程]